RFID Access Device with Segmented Antenna for Casino Chip Identification
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Solution Overview
Problem
Existing RFID tag systems in casinos face challenges in controlling the magnetic field range for accurate identification and writing of gaming chips, leading to difficulties in reading RFID tags at desired distances and potential erroneous readings due to unwanted tags within the magnetic field range.
Innovation Solution
An identifying information access device with an electromagnetic wave generating antenna and a non-contact control device that integrates an electromagnetic wave receiving antenna, allowing for controlled generation and reception of electromagnetic waves to power and control the device, enabling precise magnetic field control and RFID tag reading/writing without complex wiring or electrical contact.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the range in which the magnetic field generated from the antenna extends is expanded, then it is possible to read out the RFID tag positioned farther than the predetermined distance from the antenna, but if there is an undesired RFID tag within the extent of the magnetic field, its RFID tag may be read out
Solution Approach 1:
The patent divides the magnetic field control into multiple independent coils (first coil and second coil) that can be controlled separately. This segmentation allows the system to expand the magnetic field range by activating both coils while maintaining reading accuracy by independently controlling which coil generates the magnetic field at any given time, thus preventing erroneous readings from undesired RFID tags.
2Adaptability or versatility
If control signals for both expanding and narrowing the magnetic field range are generated and supplied to wiring, then both functions can be achieved, but the control and structure become complicated
Solution Approach 1:
The patent combines the control functions for both expanding and narrowing the magnetic field range into a single control signal line. The control device selectively generates control signals that are supplied through this single line to either the first coil or the second coil, achieving both field expansion and contraction capabilities without requiring separate wiring for each control function, thus simplifying the overall structure.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution simplifies the control and structure of the magnetic field, allowing for accurate reading and writing of RFID tags within a desired range, reducing erroneous readings and enhancing operational efficiency in casino environments.
Implementation Method 1
an electromagnetic wave generating antenna part (22) for generating an electromagnetic wave
Implementation Method 2
the electromagnetic wave receiving antenna part (32) receives an electromagnetic wave generated by the electromagnetic wave generating antenna part (22) to generate electric power
Data Source
AI summary
It is possible to read from and write in an RFID tag, and also to operate other devices. A non-contact control device is provided which is formed to have no electrical contact with the electromagnetic wave generating antenna part and integrally with the electromagnetic wave generating antenna part. The non-contact control device receives an electromagnetic wave generated by the electromagnetic wave generating antenna part to generate electric power, and controls a controlled device based on the generated electric power.